first commit

services/csharp/example/Controllers/ApiControllerBase.cs

@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace SequenceAuth.Example.Controllers;
+
+[ApiController]
+[Route("[controller]/[action]")]
+public abstract class ApiControllerBase : ControllerBase
+{
+    protected Guid UserId 
+    {
+        get
+        {
+            var options = HttpContext.RequestServices.GetRequiredService<Microsoft.Extensions.Options.IOptions<SequenceAuth.Lib.SequenceAuthOptions>>().Value;
+            return Guid.Parse(HttpContext.Items[options.UserIdItemKey]?.ToString() ?? throw new UnauthorizedAccessException());
+        }
+    }
+}